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<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>引入方式1</title>
    <style>
        h1{
            color: green !important;
        }
    </style>
</head>
<body>
    <h1 style="color: red; font-size: 20px">一级标题</h1>
</body>
</html>